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Spectroscopic probing of the effect of alkanols on the properties of the head group region in reverse micelles of AOT-heptane-water
- Source :
- JOURNAL OF COLLOID AND INTERFACE SCIENCE, Artículos CONICYT, CONICYT Chile, instacron:CONICYT
- Publication Year :
- 2003
-
Abstract
- The effects of addition of alkanols (ethanol, n-hexanol, and 3-ethyl-3-pentanol) on the micropolarity and microviscosity of the head group region in reverse micelles of AOT–heptane–water have been investigated by fluorescence probing methods (ANS fluorescence yield and TMADPH fluorescence anisotropy), complemented by the use of the solvatochromic probe ET(30) in absorption spectroscopy. For all the alkanols considered, ANS fluorescence in AOT reverse micelles (at W=3) is quenched by additive incorporation, being the effect elicited almost independent of the alkanol chain length and topology. As sensed by the ET(30) parameter, the micropolarity of the micelle surface increases, remains unmodified, and decreases upon addition of ethanol, 3-ethyl-3-pentanol, and hexanol, respectively. While ethanol barely modifies the fluorescence anisotropy of TMADPH, 3-ethyl-3-pentanol and n-hexanol addition strongly decrease it. The similarity of the tendencies of ANS data to TMADPH anisotropies and the differences between ANS data and ET(30) values would indicate that, at least for 3-ethyl-3-pentanol and n-hexanol, microviscosity, rather than micropolarity, must be considered to interpret the effect of the alkanols upon the fluorescent behavior of ANS.
- Subjects :
- Heptane
Absorption spectroscopy
Solvatochromism
Photochemistry
Fluorescence
Micelle
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Biomaterials
Microviscosity
chemistry.chemical_compound
Colloid and Surface Chemistry
chemistry
Organic chemistry
Fluorescence anisotropy
Hexanol
Subjects
Details
- ISSN :
- 00219797
- Volume :
- 258
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Journal of colloid and interface science
- Accession number :
- edsair.doi.dedup.....7709ed2538c307620119f7bf8f2f8140